US Bridges

N Highland Ave over Rock CR

Good

Clay County, Missouri · S 1 T 50 N R 33 W · Structure no. 36830

Built
1950
75 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
3,161
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Highland Ave over Rock CR is a concrete culvert carrying N Highland Ave over Rock CR in Clay County, Missouri. It was built in 1950, so it is 75 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,161 vehicles a day, roughly 5% of them trucks, projected to reach 5,058 by 2044. The structure is 21 ft (6.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesN Highland Ave
CrossesRock CR
LocationS 1 T 50 N R 33 W
RouteCity Street 0
Coordinates39.17478, -94.55912
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.5 m)
Longest span9 ft (2.7 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,161 (2024)
Projected traffic5,058 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N Highland Ave over Rock CR built?

It was built in 1950, making it 75 years old in 2025.

What condition is N Highland Ave over Rock CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does N Highland Ave over Rock CR carry?

About 3,161 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is N Highland Ave over Rock CR?

The structure is 21 ft (6.5 m) long with a longest span of 9 ft (2.7 m) and a deck 32 ft wide.

Who owns N Highland Ave over Rock CR?

It is owned by the City or Municipal Highway Agency.